Mangerbating 

Angrily masturbating, masturbating while angry

Noun: mangurbation

Last night I was mangerbating

Mangerbating by Mish da bish May 9, 2014

Maskerbating 

Wearing a mask while completely alone

Before I even realized it, I was maskerbating in my car yesterday!

Maskerbating by Photoist July 28, 2020

Manterboating

The placement of one's face, into the cleavage of a man's moobs, followed by the side-to-side shaking of the head accompanied with a motor-ing sound.

John made many trips to McDonalds on Friday; resulting in a hefty, yet delicious figure. Sarah was captivated by his rolls and decided manterboating his moobs at the pool the next day would be a hot idea.

Manterboating by D & L February 3, 2008

maskerbating 

maskerbating - Wearing a COVID-19 mask while driving in your car alone or walking outside alone. Go do it into the privacy of your home.

I saw somebody maskerbating in their car with the windows up, and a COVID-19 mask strapped tightly onto their face.

maskerbating by Crackerguy June 10, 2020

Angerbating

Being angry but not being able to express that anger so you furiously masturbate

Jason and Martin got into a fight, Jason was so angry that when he got home he started angerbating

Angerbating by Give_me_them_toes November 6, 2018

masterbating with a cheese grater 

Doing a task that is not a good idea

Moving this piano without help is like masterbating with a cheese grater.

masterbating with a cheese grater by matt1975 September 10, 2012

masterbating 

Expertly jacking off.

Guy 1:Man, I think steve's masturbating again.
Guy 2: From the sound of it, he ain't just masturbating, he's MASTERbating.

masterbating by Sir Fizwheel Humperdink October 5, 2007